Do you mean you want to use a font not on google fonts? Or just a google font that isn’t listed i the dropdown within the theme options?

As for the heading color, if you can point to a specific heading type and give a link to an example page showing it we can give you the css needed to modify it. There are quite a few headings throughout the theme so I don’t want to give you the incorrect css change.

- usually I ment a free font which is not on google fonts (A&S Speedway), but if it is easier to take a similar google font that is not listed in the dropdown within the theme, I would also take this (i.e. Arizonia), I have tried to change the font with the plugin “wp-google-fonts” as recommended by Peter, but nothing changes

- the heading on the main page, that says in the demo “Hello and welcome friend! This is Propulsion, a responsive business portfolio and eCommerce Theme”

The easiest solution is indeed to use the plugin. This will load in the font for you at the very least. Can you link to your page with the plugin active so we can see whats causing it not to take the correct font you’ve chosen?

Thank you very much Peter. I don’t mind it to mention the details since the side still has no content. I planned to change it afterwards anyway. If I would now reinstall the theme, as mentioned from Devin (because of those social media buttons) would the google fonts plugin stay?

Generally you can change the font size for the H1 elements by adding the following CSS to your Quick CSS (located under the Styling Tab in the theme options) or the custom.css file in the css folder of your theme files: